Create a Node map to get proper node translations

In a multi-language setup, before this commit the Node's Translations() method
would return some "dummy nodes" that would point to the correct page (Permalink),
but would not be the same as the node it points to -- it would not have the translated
title etc.

The node creation is, however, so mingled with rendering, whihc is too early to have any global state,
so the nodes has to be split in a prepare and a render phase. This commits does that with as small
a change as possible. This implementation is a temp solution until we fix #2297.

Updates #2309

hugolib/hugo_sites.go

@@ -39,6 +39,10 @@ type HugoSites struct {
 	runMode runmode
 
 	multilingual *Multilingual
+
+	// Maps internalID to a set of nodes.
+	nodeMap   map[string]Nodes
+	nodeMapMu sync.Mutex
 }
 
 // NewHugoSites creates a new collection of sites given the input sites, building
@@ -50,7 +54,7 @@ func newHugoSites(sites ...*Site) (*HugoSites, error) {
 		return nil, err
 	}
 
-	h := &HugoSites{multilingual: langConfig, Sites: sites}
+	h := &HugoSites{multilingual: langConfig, Sites: sites, nodeMap: make(map[string]Nodes)}
 
 	for _, s := range sites {
 		s.owner = h
@@ -92,14 +96,39 @@ func createSitesFromConfig() ([]*Site, error) {
 	return sites, nil
 }
 
+func (h *HugoSites) addNode(nodeID string, node *Node) {
+	h.nodeMapMu.Lock()
+
+	if nodes, ok := h.nodeMap[nodeID]; ok {
+		h.nodeMap[nodeID] = append(nodes, node)
+	} else {
+		h.nodeMap[nodeID] = Nodes{node}
+	}
+	h.nodeMapMu.Unlock()
+}
+
+func (h *HugoSites) getNodes(nodeID string) Nodes {
+	// At this point it is read only, so no need to lock.
+	if nodeID != "" {
+		if nodes, ok := h.nodeMap[nodeID]; ok {
+			return nodes
+		}
+	}
+	// Paginator pages will not have related nodes.
+	return Nodes{}
+}
+
 // Reset resets the sites, making it ready for a full rebuild.
 func (h *HugoSites) reset() {
+	h.nodeMap = make(map[string]Nodes)
 	for i, s := range h.Sites {
 		h.Sites[i] = s.reset()
 	}
 }
 
 func (h *HugoSites) reCreateFromConfig() error {
+	h.nodeMap = make(map[string]Nodes)
+
 	sites, err := createSitesFromConfig()
 
 	if err != nil {
@@ -236,6 +265,7 @@ func (h *HugoSites) Rebuild(config BuildCfg, events ...fsnotify.Event) error {
 
 	firstSite := h.Sites[0]
 
+	h.nodeMap = make(map[string]Nodes)
 	for _, s := range h.Sites {
 		s.resetBuildState()
 	}
@@ -359,6 +389,23 @@ func (h *HugoSites) setupTranslations(master *Site) {
 // Shortcode handling is the main task in here.
 // TODO(bep) We need to look at the whole handler-chain construct witht he below in mind.
 func (h *HugoSites) preRender() error {
+
+	for _, s := range h.Sites {
+		// Run "render prepare"
+		if err := s.renderHomePage(true); err != nil {
+			return err
+		}
+		if err := s.renderTaxonomiesLists(true); err != nil {
+			return err
+		}
+		if err := s.renderListsOfTaxonomyTerms(true); err != nil {
+			return err
+		}
+		if err := s.renderSectionLists(true); err != nil {
+			return err
+		}
+	}
+
 	pageChan := make(chan *Page)
 
 	wg := &sync.WaitGroup{}
@@ -418,7 +465,7 @@ func (h *HugoSites) preRender() error {
 }
 
 // Pages returns all pages for all sites.
-func (h HugoSites) Pages() Pages {
+func (h *HugoSites) Pages() Pages {
 	return h.Sites[0].AllPages
 }